Persistence of Propanil, DCA, and TCAB in Soil and Water Under Flooded Rice Culture
1977
Deuel, L. E. | Brown, K. W. | Turner, Francis Culer | Westfall, D. G. | Price, J. D.
Field experiments were conducted to determine the residue levels of propanil (3′,4′-dichloropropionanilide), DCA (3,4-dichloroaniline), and TCAB (3,3′,4,4′-tetrachloroazobenzene) in the flood water and Beaumont clay soil under normal rice (Oryza sativa L.) cultivation. Propanil applied as a foliar spray at 3.4 and 6.8 kg/ha 24 hours before flooding was dissipated from the flood water within 24 hours following the flood. The amount of propanil dissipated corresponded to the DCA concentration in the flood water at 24 hours, indicative of biological degradation of propanil to DCA. TCAB was never detected in other than trace quantities. Neither propanil nor its metabolites were detected in soil samples collected at 2.5–5.0 cm and 17.5–20.0 cm below the surface 24 hours following the application of the flood water.
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